BEIJING - Diplomatic efforts to kickstart the stalled six-nation talks on North Korea's nuclear program have got underway in Beijing as envoys to the negotiations converged on the Chinese capital.

The United States' chief negotiator to the six-nation forum, Christopher Hill. [AFP]

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The United States' chief negotiator to the six-nation forum, Christopher Hill, said after arriving on Monday afternoon that he remained hopeful of the full-fledged talks resuming imminently, ending a year-long hiatus.

Hill, who held meetings in Beijing last week with China's envoy to the talks, Wu Dawei, joined top envoys from Japan and South Korea already in Beijing.

South Korean and Japanese press reports said the North Korean representative to the talks, Kim Kye-Gwan, may fly in, although officials from the other six-party nations could not confirm this.

It looked unlikely that the envoys would all meet together here, with the focus instead on bilateral meetings aimed at setting a date for restarting the talks.

"We'll be talking to our Chinese hosts again about a date," Hill said at Beijing airport, before repeating the US position that it was vital to ensure beforehand that substantial progress would be made when the talks resumed.

"Again the issue for us is to make sure we are extremely well planned for six-party talks, which we expect to get going again very soon."

Hill did not give any indication whether he planned to meet North Korea's Kim in Beijing this week.

"We've always said we are prepared to meet with DPRK (North Korean) officials in the context of six-party talks but let me first talk to the Chinese and see what they have in mind," he said.

South Korean envoy Chun Yung-Woo, who arrived on Monday morning, said he intended to meet only with China's Wu, according to South Korea's Yonhap news agency.

Japan's top negotiator, Kenichiro Sasae, flew to Beijing on Sunday and planned to meet separately with Wu and Chinese foreign ministry officials, a Japanese embassy official said.

The six-nation talks, which also include Russia, were launched in 2003 to persuade North Korea to abandon its nuclear ambitions, but broke down a year ago when Pyongyang walked out in protest at US financial sanctions against it.

Resumption of the talks took on a new urgency after the North staged its first nuclear test on October 9, sparking international condemnation and United Nations sanctions.

Pyongyang agreed on October 31 to return to the negotiating table after a day of secret meetings in Beijing between the chief six-party envoys from the United States, North Korea and China.

However, the parties have since been unable to announce a start date. Hill said after his meeting with Wu last week he hoped the talks would resume in the middle of December.

Yonhap quoted South Korea's Chun after his arrival in Beijing on Monday morning as saying that the onus was on North Korea to ensure the six-party talks got underway again.

"The important thing is North Korea's political will to dismantle its nuclear weapons, not what we demand," Chun said, according to Yonhap. "The North is well aware of what it should do."

It was not known whether Russia's envoy planned to visit Beijing this week. A spokesman at the Russian embassy in Beijing said he had no information.

China has always hosted the six-party talks.